Wheel finishing machine



Jan. 8, 1952 E. N. BRoDr-:N

WHEEL FINISHING MACHINE Filed Oct. 19, 1946 5 Sheets-Sheet l INVENTOR l PWIN H. IZOVEN ATTGRNEYS Jan. 8, 1952 EL N. BRODEN `581,928

WHEEL FINISHING MACK-HNE'y Filed Oct. 19, 1946 y i 5 Sheets-Sheet 2 45 T45 INVENTOR EDWYN NEDQODEN A'rrokngvs Jan. 8; 1952 E. N. BRoDEN WHEEL FINISHING MACHINE 5 sheets-sheet 3 f Filed oct. 19.`194e :N v E. N'Tvo R" vwl/i n. bovm ATTORNEYS Jan. s, 1952 Filed OOC. 19, 1946 S sheets-sheet 4 EDWIN JLPODEN ATTORNEYS Jan. 8, 1952 E, N, BRQDEN 27,581,928

WHEEL FINISHING MACHINE Filed Oct. 19, 1946 5 Sheets-Sheet 5 INVENTOR ATTORNEYS Patented Jan. 8,

WHEEL FINISHIN'G MACHINE Edwin N. Broden, Assonet, Mass., a'ssignor to The Firestone Tire f & Rubber Company, Akron, Ohio, a corporation of Ohio Application October 19, 1946, Serial No. 704,368

Y This invention relates to wheel-finishing machines, and more especially it relates to apparatus for finishing small wheels or casters made of molded plastic, which, for example, maybe soft rubber or hard rubber, or rubber-like composition.

Wheels of the character mentioned usually are shaped and hardened in an internal cavity in a separable mold structure that leaves an overow iin or rand located in the central plane of the wheels and extending circumferentially thereof. The wheels each have an axial aperture therein in which a tubular metal bearing orbushing is mounted with a Vforce fit. After the wheels are provided with the bearings or bushings mentioned, they are subjected tothe finishing operation which consists of removing the overflow fins or rands, and then smoothing the perimeters of thel wheels. Heretofore the finishing operation has vbeen manually performed, the wheels being mounted in a lathe, a-iile or rasp being employed to remove the mold flash or rand, and a piece ofl emery cloth used to smooth the peripheral surfacel of the wheels. l Production by the prior methodv was about 125 units per hour per operator.

'The chief objects of this invention are to pro#- vide a machine for finishing wheels of the character mentioned that is automatic in operation; that will effect increased production; that will effect uniformity of product; and that will reduce the unit cost of the finishing operation. Other objects will be manifest "as the vdescription pro-- ceeds. I

Of the accompanyingdrawings:

Fig. 1 is a side elevation of apparatus embodying the invention, in non-operating condition, and the worl: therein, as viewed from the right of Fig. 2, a part thereof being broken away and the Work ybeing shown in section; l' i t Fig. 2 is an end elevation of the complete apV paratusas viewedfrom the left of Fig. 1;

Fig. 3 is a plan View, on a larger scale,- of the work-trimming instrumentality of the apparatus, the means for mounting and driving the work, and the work itself as Athey appear immediatel prior to beginning a cycle of operation; 1 H i -f -Figf 4 is aview of the elements shown in Fig. Y Sduring the work-trimming operation; y

Fig-5 is a View ofthe elements shown inl Fig. 3 atthe completion of-a cycle of operation, showing the discharging of anished work-unit;A -Y

Fig. 6 is a side elevation of the work-smoothing instrumentality of the apparatus;

6 Claims. (Cl. 82-2.7)

Fig. 8 is a detail sectional View on a smaller scale, of the other work-holding member; Fig. 9 is a section on the line9-9 of Fig. l showing means for periodically operating smoothing instrumentality;

Fig. 10 is a side elevation, on a larger scale; of the work-trimming instrumentality and th mechanism that operates the same; i n y v Fig. 11 is a plan view of another embodiment ofthe work-trimming instrumentality, and the work -(in section) With-which it is operativelyv engaged; and f Fig. 12 is a section on 'une l2, |72 of Fig. '11.

brackets -I4,?` I4 `in which is journaleda tubularl driven shaft I5 that is disposed along the center-- line of the machine. Thrust collars 16; I6- mounted on the shaft inllaterally abutting relation to the bracketsI 4 restrain the shaft against axial movement.

flange, and contiguous end face of the shaft; constitute a work-engaging and driving surfaceas subsequently-will be explained. v lr v The end portion ofv shaft I5 remote from'saidY flanged end overhangs the vframe I, 'and hasy mounted thereon a two-step pulley 2 about-Which is trained a side-driving transmission belt 2l the` latter also being trained about a two-step pulley 22 mounted on the shaft of -an electric motor 23 that is -mounted upon the shelf II. The motor is driven constantly during the operation/of themachine. The Y arrangementis such that the motor 23 drives the shaftl I 5 at all times the motor is in operation. The direction of rotation of shaft I5 is indicated by-arrows in Figs. 3, 4, and 5. The

provisionA of the two-step pulleys 20, 22 makes itv possible to rotate the shaft I5 at different speed;-if'deslred.` Y Y Also mounted on the overhangng pcirvtionbfl shaft I5, vbetween pulley 2D and bearing bracket It,` is a pulley 25 about which is trained a'trans- Fig. 4'Vis a detail sectionall view, lon alarger' 1 scaleVof one ofthe .work-holding members; lf mission belt 26, the latter also being trained about apulley 2l that is mounted upon a counter-shaft 28. Said ccunter-shaftis journaled in the frame the work- That end'portion of the shaft- I5 that is disposed beside, and above there-` cessed region I 3 is formed witha flange I'I, whichl I0, and has fixed thereon a relatively small sprocket 29 about which is trained a sprocket chain 30, the latter also being trained 'about av relatively larger sprocket 3l mounted upon the projecting end of a cam shaft 32. Said cam shaft is disposed parallel to shaft I 5 and countershaft 28, and is journaled in bearings 33,'33 mountedj.upo n, frame lil. The: arrangement issuch thatythe motor 23..drives-the cam shaft-.321 atrelatively slow speed as compared to the speed Yof the shaft I5, the ratio being about 1 to 19.

Mounted upon the top ofV framev Il), in axial alignment with shaft I5 and to the righi'rofrecess1v I3 as viewed in Fig. 1 is aidouble; actingiiuid pressure operated cylinder ghavinga1 piston rodz or plunger 36 projecting from the end thereofv; that confronts ange Il of said shaft .15.. A s is.. best shown in Fig. 7, the outer end of plunger 36 is. formed with a short axial extensionf 31. o reduced diameter on which a thrust bearing 38 is., mounted. Adjacent..it s..end the plunger.V also carries bearing; 3 9, 39 that. are maintainedA in. spaced-:apartY relation byan intervening spacer sleeve 4I) xedly mounted on the, plunger. `Journaled upon bearings ,38, 39isanose piece. 4 Iv haying ira closed,v frustogconical. forward '.end, the rear lend-of said nose piece having a vcollar ,42 secured theretoin abuttingfrelation vto rear bearingj to retain;said nose piece onthe plunger. Asleeye 43 open at v its f-front v,end, is mounted uponltljile plunger andfencloses allof nose. piece 4I except the tapered front end thereof,said sleeve. being secured -to plunger 36 byset screw 44. The arraneementfis .Sueh that. .the nose Lpiece .4 l may fente freely., relatively... ef, plunger 3e and. S1eeve...43;. Y

The rpurpose ,offthe plunger 35 to conne a Workgpiece between itsnose piece; 4I andthe driyeniiange I'I Von.the,,confronting end of rotary shaft I 5, whereby` said work piece is frictionally i drive vsaiduliange Il and ,nosepiecev4l thusconfl stitutin g A in*y eiect; a i chuck.v The work pieces,

e arev L desif,{11jf 3. ted 45, i4 each consisting of a circular.

dise lor ,-whe el ofuhard rubber composition, and

having a tubular, meta l, axial.. bushing, Figs,

3 and mo1 ded intoits structure. Y

While awork piece isconned in and rotated by the driving ethiek, it is penteredwith relation theretolbyta tapered `round-nosed pilot 48 that.. pleieeis. axially from .theend @f .sheftle and is reo eived within V the bore of the bushing 46-gof. thevworlgrpiece. Asis best, shown in Fig.. 8,A the.- pilotfis located in an laxial counterbore .0r recess 49 in the endc f nsha ft i I5, n ivhioh counter-Y i bore, or Yrecess is of sufficient depth .toenable the pilot completelyto be withdrawnthereinto. The pilot v48I is 'formed on ,magna ,of .a spindle. so, ofreduc d dianmeter;lv which `spindle is ,urtherref.L dueed 1n diameteratits rear-,end portion so as.t to.; constitute e ...Stem 5 I.. Thezaspindle .50 and. stern -5 I `are slidably mountedl for axial movement ma here. 52, menait! 5..-the rear .end f said bore. hayinglan axially apertured Vpli1g .;53A threaded. thereintohrough which plug Tthestem, I slide.. ably. .extends...:; Surreundinastem 5 I l, Within .bore 52;.is a compression .Sprine54that bears against.- plugg53 and` againsll the shoulder;.-formediat ;thu juncture .of spindlell and stern-5l, said spring, normally urging the pilot 48 outwalldlyf=rom-the .f eeuriterbore 49.y

The pilot 48 `is retracted vinto ,the ,counterbore i, 49: periodically in.` determinate .ptme-relatiorrto si thesaetion of. otherY elements .ofthe; apparatus. during .eael.1;..cye1 eef 9peratQo.-ar1.d-t;this end .an ff. Oplirlamjli lmtkmlonallzshafj 32;.

stern. may rotate relatively thereof.

4 The cam 5l' has a camming surface on one lateral face thereof that is adapted periodically to engage a cam roller 58 carried by a bracket 59 that is mounted upon a slide-rod 65, the latter being disposed above and parallel to cam shaft 32, and mounted for axial movement is suitable brackets SI carried by the frame iii. Fixedly mounted upon; the outer: endfof slide=rod 50,

Vwhich is ati-.the left thereoff'asfviewed'in Fig. l,

is an arm 62, the opposite end of which loosely embraces the stem 5I of the pilot 48 so that said A thrust bearing"V is 'mounted upon stem 5I in abutting relation;Y tofthe, outer face of arm 62. The

arrangement issuch that upon each revolution of: the :cam: shaftr32 the cam 51 will retract the pilot 48 against the force of spring 54, the latter again projectingthep-ilot outwardly as the cam passesiout of engagement with cam roller 58. It will be understood that pilot 48 rotates with the shaft .I5 .at.all times, beingfrictionally driven thereby,

The,V work-.piecesV 45 v are. delivered to the machine bygravity, an. inclined chute being provided. for the purpose, The .work-piecesA are4v` manually placed in the chute at the upper-endv thereof, and rest in uprightposition upon their circular,V perimeters so. as to roll freely. down wardlywhenthe lower end ofI the chute .is unobstructed. A .work-piece discharged .at the lower end .of the-chutev is received upon a painof stop-studs .or pins 65,165 .that support theworke" piece substantially inaxial alignment with-the nose-piece l4I and flangeL Il. VAv work-piece located on the stop-pins '66 as describedobstructs piston rod 36. effected in determinate time-relation to the operation of other elements of the machine,.and .toHV this. .end a ycontrol valve Vi'I- for the cylinder is. mounted onavbracket ,5 8 secured to frame -I0- below-the cylinder, saidvalve being operated automatically by a `cam 69.` Fig..1, mounted onl the camshaft 32.v When the nose-piecaAI is projected .by operation of cylinder 35 and the work. in front/of said nose-piece. ismoved axially,A

rinto .engagement `with the: constantly rotating flange Il. of .shaft I5, the pilot 48 `is received-in'j the bore of bushing 46 of the work-piece, withn the result thatthe ,vwork-piecefis.centered or axially, valigned Awith said ange and shaft. The spring 54-enables the pilot 4B -to retract` some what, .when-*engaged by; said bushing .f 45.

This' 1 position of `the Work-pieca45 is shown inrFig. 4;-` said work-piece beingsrapidly rotated-by therotatingshaft l5, andthe plunger sleeve 43- obstructingthe.. path of the lowermost *work-piece# invchute 65. Itis while the worl piece is being rotated that the overflow 1in or` rand is removed* therefrom.

To .this .end a pivot. pinJII is vmounted upon the frameJIl and extends .horizontally infront y offthe recessed .region I3 therein. Pivotally mounted on `pin TlIs a pairof spaced-apart, arms "I2, 12 Vwhich attheirv upper. ends carry atrim# `ming device, .the same beinglocated inthe planeL trimming device comprisesa chisel-like cutter-l3 f thatfpresen-ts a flatI cuttingl edgefto the 'workupon opposite sides of said cutter 13. The rollers 14 have their axes disposed at an angle to each other, as shown, so that they may bear yflush against the slightly sloped or tapered peripheral faces of the work-piece at each side of the medial circumferential plane of the work-piece, in which plane the overflow rand is located. An adjusting screw 15' engages the rear end of the cutter 13 for moving the latter relatively of the rollers 14 .and thus'j to vary the amount of material removed by tlie cutter from the work-piece. A set screw 16 engages the cutter for holding the same in adjusted position. At their lower ends the arms 12 are' connected by a U-shaped bridgepiece or bracket 11. Also pivotally mounted on pin 1|, between arms 12, are parallel arms 18,18 that extendfdownwardly to a point below bridge piece 11 ofvr armsr12, the lower ends of arms 18 being joined by an apertured block 19. A-rod 80 is adjustably mounted in the aperture in Vblock 19,'"said rod-having a cam Aroller 8| journaled in onel vend thereof, which cam roller engages a cam 82n'1ountedA upon cam shaft 32. A compression spring 83 suitably interposed between the arms 18 andbracket 11 provides a yielding connection therebetween whereby the cutter 13 is yieldingly urged'against a work-piece 45 by the cam 82, as shown in brokenr lines in Fig. `10.`

' The Wheel-smoothing instrumentality of the machine is a sander designated as a whole by the numeralA 85". As is `best shown in Fig-'6, said sander comprises an endless belt of abrasive material, such as sand paper 86, which belt isv trained about'two pulleys 81, 88 respectively, of which the latter is power-driven, as presently will be explained; The mounting of pulley 81 includes a compressiony spring 89 that `normally urges said pulley away from pulley 88 to maintain the'sanding belt-86 vin taut condition.v f At the-region-of the sander where the belt 86 engages the perimeter ofthe work, said belt is backed by two pairs of relativelysmall rollers 90, Y 9| of which the rollers of each pair are disposed at ananglerto each otherpwhich angle corresponds tothe `reverse 4taper-of thevwork-pieces at each side of the central plane thereof. The rollers 90, 9|. are spacedl apart from each other and so positioned thatv the reach of the belt `86 disposed between themengages the work when the sanderis moved into? engagement therewith, the arrangement being such that the belt engages a substantial circumferential area of a work-piece as it Voperates thereupon-'l The belt 86 is driven vin the opposite direction to therperipheral movement. of the work-piece; as indicated by the arrows in Fig. 6, whereby increased abrading efciency is achieved. The sanding device 85 is enclosed in a metal housing or, guard 92 except inthe region at the bottom thereof where. the belt 88 requires to be exposed so that it may engage the work.

The pulley 88'of the sander is mounted upon a driven shaft 95 that is journaled in a pair vof bearing brackets 96, 96, said bearing brackets being positioned upon a mounting plate 91, Fig. 2. Plate 91 is supportedupon brackets, such as the bracket 98, that project rearwardly and upwardly fromthe frame I0, said plate being adjustable forwardly and rearwardly on said brackets so that the sanding device may be positioned accurately for operating upon work of various diameters.v For driving the shaft 95 a pulley 99 is mounted on the end thereof remote from pulley 88. anda transmission belt |00 is trained about pulley 99 and about a pulley |0|,Fig. l that is mounted upona countershaft 102, Fig. 2journaled in frame |0, near the bottom thereof. Countershaft |02 also carries a pulley |03, and a transmission belt |04 is trained aboutrpulley |03 and a pulley |05, the latter being mounted upon the shaft of motor 23. The arrangement is such that the sander belt 86 is driven at `alltirnes the motor 231s in operation.

The sander is supported by the shaft 95 and constructed and arranged to oscillate thereabout. The limits of oscillatory movement of the sander are indicated in Fig.- 6 wherein the full line position shows the sander moved by gravity to the point where it rests upon a Work-piece, and the broken line position indicates the maximum elevation of the sander to which point it has been lifted by power-operated mechanism. To this end a lift-rod |01 is connected to the sander structure intermediate the ends thereof, said liftrod extending downwardly therefrom and having its lower end pivotally connected toone end of a rst class lever |08. The latter is pivotally mounted at |09 on abracket structure |0 on the shelf I2. The other end of thelever |08 carries a cam roller that bears against a cam |2 that is mounted upon the cam-shaft 32, as is clearly shown in Fig. 9. The arrangement is such that the sander is lowered into operative engagement with the work and lifted therefrom' in determinate time-relation to other operations of the machine.

Operation of the sander 85 produces dust composed of sand particles and particles of material abraded from the work. Such dust is removed by way of a duct l5 extending from the rear end of the housing or guard 92 of the sander, said duct having a flexible section (not shown) to enable the sander to oscillate as described during operation thereof. The duct extends to any suitable receptacle (not shown) wherein the dust is collected. For dislodging dust from the sander belt 86 and inducing it to enter the duct ||5, a jet of air under pressure is directed against the belt substantially tangentially thereof as it passes over driving pulley 88, said air being conducted to the sander by a conduit or pipe ||6 that includes a exible section ||1 to enable oscillation of the sander. Air is discharged against the belt 86periodically, and only during those intervals that said belt is Aoperatively engaged with the work. To this end the pipe ||8 extends to fa con# trol valve |'|8 that is mounted upon bracket 68. beside valve 61, said valve ||8 being operated automatically by a cam ||9 mounted upon cam shaft 32. 1

When the finished work is released from the driving chuck, it rolls by gravity down a chute |2| at the rear of the machine and drops into a suitable receptacle |22 positioned at the lower end of said chute.

Inthe operation of the machine,` assuming the various elements thereof to be in the positions shown in Figs. l and 2 vand the motor 23 idle, the chute 65 first is loaded with the small Wheels 45 that are to be trimmed and finished, the leading wheel of the series resting upon the stop-pins 66. The motor 23 then is set in motion to drive the shaft |5 and the cam-shaft 32, the latter making about 1 revolution to each 19 of the shaft |5. .The motor also drives shaft 95 of the sander 85. As the cam-shaft 32 rotates it initiates a cycle of operation by operating valve 61 in a manner that charges the rear end of cylinder 35 and projects the plunger 38 thereof whereby the nose piece 4| of the chuck structure on the end Mamas.

` thereof engages the lovtnermost.V workpiece-...45

and moves-.it'axially towarctthe rotatingiange :I'I on: shaft'l. Dum'ngfsu'ch movement. thelpilot renters the bores-ofebushingll 'ofthe workapi'ece so ithatthelatter is positioned zo-axially: fofssaid flange: If'I; During this Y operationthe; pilot may be ,forced rearwardly.someWhatfagainstfthe, force ovfzspring 54.2 the Workepiece is driven: byi'the shafts t5.;l cam :82 operates.' cam roller 811 tol-move title-cutter 13andlrollers1 'Ilkir'ito operative gagement, with. tliewlorlrf'piece,V as shown* in Figa 42, wherebf said'.` cutter removesA the f.-'- overflow# rand 'said' work-piece. f- The.v cam. 82- 'holds` the cutter: imr engagement: with; the itverlr-pi'e'cefwlaile the latter makesaboutsize revolutions; andi-Athen retracts the'fcutter; Vat 'whi'chg-time ;cam=. I' I 2,-- opi? crates thel'sanderff-tolower the same and cam I L9 .operates valve-- I l'8to deliver-airto the .sander..v After, :they sanderhas voperatedz-fupon the 4wor-lee 'pieccyfor a. `detern-iinate='interval sufficient to smooth'and iin'ish the.:V work-piece, camsl I'Z-and M58 operate. toiaisefthe, sander and out o1= the air thereto,v and at the same time vcam;I engages cam roller 58A to 4eiect-r retraction ofpilot 4:8'so that: it is; entirely outside; the. plane-fof the; work.- piece;` Concurrentlyvwith the retraction. of: the pi1otcam 69; reverses the position' of valve-161; to reyersethe; cylinder 3.5 and? withdraw`v nose-piece 4Iv from engagement: with. the work-piece; vThe latter thus released rolls down the chute I2I-,'a's gingplfigf: g5; andi'falls'into the receptacle. 22. Aifs1thcchuckfstructureortthe; end ofi plunger 36 becomes fully: retracted, iti` nolonger obstructs heale. of-,work-pieceslinthe chute 65 and lthe leadingwork-piece in tloechute'-l isenabled to moi/erizo', the;v advanced-positiomwherein it rests uponfx-the; stopepins 5%.* 'Ihis-y completesv a cycle of operation xisllfiichfA is lrepeated continuously. and

automatically so :long as' tlier'motorf 23 isdn loperation and there; are work-pieces in the `chute 6,5.;`A -Thefniachines completes; about 1`5 cyclesfoi @Deration--each'minuta .Eromthe foregoing it. will be `apparenttl'iat the inVention-sayes'time and labor'as' compared to.

priorfmpractice; 'and also increases production, whereby-unit cost is reduced. lThemachine.L proa ducjes, worltgh'aving uniformity of iinish, and-`improve/s' work-ing conditions by removing from the air the dust;A resultingv from the manufacturing prbovcessft J Y Sometimeslthework-pieces 45e-re-` composed otsof rubber;compositionfinstead of hard;` rubber; in Whichgcasefa; somewhat 'diierent' trimmer; is employed. As shown in Figs. l1 and 12, the trink.

mer that Operates on Soft rubber work-piecesaa comprises-amounting block; I25 that is carried in the -uiziperf'-endsffof theY arms 'I-2, said fblock formed-,with two-parallel bores inwhich respective Aspindles I 26 are mounted.; `vSaid spindles project; irom.- the block I 2 5-toward` the. Work-piece 4.5i, and are Yyieldinglybackedby respective. compression springs, |21 that. are. conlnedin the block.l by a closurev plate "I2 BllfrKRota-tably mounted upon the projecting'outer ends 'ofY spindles 126 Yare respective' disc' cutt'ers I30 IIIIIIv that have pe- -Whatfis'claimed-is: l 't 1f Ai wheel. nishingr ..machinecomprising `a work-holding.l chuck.v composed of" tw confronta:A ing-.axially aligned.. rotatable. elements, powerdriving means; for one of. said elementsxtretate. the, same..l a fluid pressure coperatedipmeanszafor moving the other. chuck'. elementzaxiallyltoward: and.-v awayv from;4 the;iirst;.mentioned` chuclcaelee. ment; to! confine a., workepieceatherebetween, ea freely: rotatable. nose-piece n journaledL l onsitthev work-engaglng-fend; of; lastmentionedi chuck;- el ment, I airtapered pilctlocatedat the. axis, .Qivthe' richter-drvenV chuck; eleme thereirom. adapted to' enteran axial., apertura aworkfpiece togcntcr the Same.,- xeldina means. normaux-holding.- Saidnlot actoietedritieni and. power operated means.y for retractmethe. pilotv out o f eneaeemntwith the workindetermi at. ,v time-relation to operationof .the.flud-. pres cylinder` I 2.` A. combination. as ,deiled ingx aworktrimming device. and means for A ingvthey same into andout of.v operatiyeengag.- ment withthe. Work in determinate. time-relation to. the operation of thenuidpressure, onerated Y'nle-l f 1 i; 3. In. a wheelfnishing machine comprisiuaa work-holding chuckcomposed of. twofconronting rotatable.. elements, power. m'eans. connected with, oney of., said elerrl'entsito.'` rotate' `.the saine, a fluid pressureroperated;cylinden connected theother ofsadelementsto move.itaxially m. an inoperative position relativelyv remote .fijo v Yfthe, rstfmenticnedelement .to ancona vefnositicu' relatively. Marthe-.sama tol-Connei a.-W0rk-pete therebetween. all; inclined chute. discliarginasaid worky-pieces by;j gratity into the,A space between Said., chuck. elements. when; the axiall-x movable element-is in .Operativepcsitiom Sadfaxialltmollff able.: element harina ai naitot. .stop-stud@ ohr. structine the. movement'- Of Moltke-pieces. 11ik Said chute. when in operative positiom a tapered-.pilot menubar. locatedat the-axis. 0f. the power-.rotated chuck.; element.. yielding meanss normally.; holdna saidpilotA in projected position infcentering.en-. gagexnent in an axial apertureI,inA a )york ieee,- in. the-chuck; and p oWer-llerated means f tracting the; p ilot out ofaWorlg-engagingjpos l tion. in determinate .time-relation. mathe oper,... tion. of said fluid,V pressuracynder; that-mow; the other chuck elements e; `In awheel-nishing machina of` the; @hara acier described, ayons-holding chuck. comparsi.: of` two, confronting; rotatable.- e1ernents;.;power means connected to the firstofT saidy elemenfto rotate the same, a` Huid pressurefoperatedfcylinder connected to the second vofisaid'elernents1QV moveit axially from an` inoperative; positionvrelagf: tively .remote'fromftheffrstrmentionedelementtto an operative position relatively near thesame;l to.v connea Work-'piece therebetween, s anffnclined chutel .discharging said;` Workhpieces; by.: .gravity into the y.space between. said chuck; elementsmhen' the axially l'movableY 'element is. in.;retracted:pcsi.V tion,` said'lfaxiallymovableg second :elementihaving ai pair lof 1stopastuds'ztobstructing f the movement of "work-pieces; in f said chute lwhen in operative position, an tapered pilotmember located.` axially ofthe poWer--rotateLc-i'chuckV element; yielding means normally holding vsaid,pilotiinzprojected position' in. centering: 'engagement'.r in i. an axial aperture inl aworkepiec'e' in thef chuck, trimming means f comprising a cutter' andaA pair roti gauge rollers; mounted? 'on opposite sidesf o'fsaitlvv cutter; saidf'rollersbeing 'adapted' to'bearagainstfr theperipheral surface of the work-piece and to adjustably control the amount of material removed by said cutter, a continuously driven cam shaft having cams mounted thereon for actuating said the same, to confine a work-piece therebetween,v

an inclined chute discharging work-pieces by gravity finto the space between said chuck ele- :f

ments when the axially movable element is in retractedposition, said axially movable second element having a pair of stop-studs obstructing the movement of work-pieces in said chute when in operative position, a tapered pilot member located ,c

axially of the power-rotated first chuck element, means normally holding said pilot` in projected position in centering engagement in an axial aperture in a Work-piece in the chuck, and poweroperated means for retracting the pilot out of v;

work-engaging position in determinate time-relation to the operation of said iluid pressure cylinder that moves the other chuck element, trimming means comprising a cutter and a pair of gauge rollers mounted on opposite sides of said cutter, said rollers being adapted to bear against the peripheral surface of the work-piece and to adjustably control the amount of material removed by said cutter, a continuously driven cam shaft having cams fixedly mounted thereon, cam followers associated with said cams and the ac'- tuating means of said pilot, chuck, and trimming mechanism whereby said Work-pieces are successively delivered to said pilot member, the second chuck member brought into operative position for rotation of the Work-piece by the chuck, the trimming means brought into operation on the work-piece, and said pilot member retracted to permit discharge of said work-piece.

. 10 6. In a wheel-finishing machine of the character described, a Work-holding chuck composed oi two confronting rotatable elements, power means i connected to the first of said elements to rotate the same, a fluid pressure-operated cylinder connected to the second of said elements to move it axially from a retracted inoperative position relatively remote from the first-mentioned element to an operative position relatively near the same, to conne a work-piece therebetween, a chute discharging said Work-pieces by gravity into the space between said chuck elements when the axially movable element is in retracted position, said axially movable second element having apair of stop-studs obstructing the movement of, workpieces in said chute when in operative position, a tapered pilot member located axially of the power-rotated lrst chuck element, means normally holding said pilot in projected position in centering engagement in an axial aperture in a work-piece in the chuck, trimming means comprising a cutter adapted to be brought into engagement with each work-piece, and power-operated means for retracting the pilot out of workengaging position in determinate time-relation to the operation of said uid pressure cylinder that moves said second chuck element and to the operation of said trimming means.

EDWIN N. BRODEN.

REFERENCES CITED The following references are of record in the' iile of this patent:

UNITED STATES PATENTS Number Name Date 1,440,494 Roach Jan. 2, 1923 1,624,913 Ames Apr. 19, 1927 1,904,152 Lovely Apr. 18, 1933 1,907,938 Storm et al. May 9, 1933 1,939,674 Elskamp Dec. 19, 1933 1,968,400 Johnson July 31, 1934 1,981,260 Yager Nov. 20, 1934 2,130,627 Kelly Sept.`20, 1938 2,176,163 Zimmerman Oct. 17, 1939 2,356,226 Delahan et al. Aug. 22, 1944 2,396,399 Veale Mar. 12, 1946 

